An archaic or obsolete term, possibly a variant or dialectal form of 'costmary' (an herb) or a fabric material used in medieval times.
Origin uncertain; possibly from Old English or medieval terminology. May be related to cost or expensive materials, or to herbal nomenclature where plants were named for their uses.
This word is so obscure that even historical dictionaries are unclear about its exact meaning—it's a reminder that countless words used by ordinary medieval people have simply vanished from the historical record.
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